Malicious PDF — malware analysis report

Static analysis result for SHA-256 91e64442400bcfd1…

MALICIOUS

PDF

75.1 KB Created: 2021-06-13 01:17:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-24
MD5: d02e8f99aaebcc4fadec4c0a72aa61b5 SHA-1: 91df2045e8435e1270b5dcc024be148f554a56c5 SHA-256: 91e64442400bcfd199bd0f5830d4dddfb0fa41339a5a28b1a44ee89cde9f8aba
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF file was detected as malicious by ML classifiers and ClamAV, indicating a phishing or trojan payload. It contains numerous links to external websites, many hosted on compromised WordPress installations, suggesting an attempt to redirect users to malicious content. The document body is heavily obfuscated and appears to contain metadata rather than user-facing content, further supporting a malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • PDF link farm points to compromised-WordPress upload storage medium PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM
    PDF contains multiple clickable links, across many distinct hosts, whose targets are random-slug files parked in the upload directories of vulnerable WordPress form plugins (FormCraft, Super Forms). This is the hallmark of the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains hosted on compromised sites. The PDF itself carries no exploit — the risk is the linked destinations.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://catamma.ru/uplcv?utm_term=beige+color+code+rgb PDF link annotation
    • https://yidinfo.net/wp-content/plugins/super-forms/uploads/php/files/r8jriseo4iedg9sc92tmob9d4t/gegokivinovunig.pdfIn PDF document text
    • https://anzmrrn.org/wp-content/plugins/formcraft/file-upload/server/content/files/16099a1648f890---73755999606.pdfIn PDF document text
    • https://wfca-czech.cz/temp/userfiles/files/jelujugumizodesevumapawe.pdfIn PDF document text
    • https://contact-house.com/fckeditor/upload/file/12256548087.pdfIn PDF document text
    • https://accesoriosalmayor.com/images/userfiles/file/38999564450.pdfIn PDF document text
    • http://staging.impactredevelopment.com/wp-content/plugins/formcraft/file-upload/server/content/files/160863451c201f---temeruduvigigob.pdfIn PDF document text
    • https://nationalcardsolutions.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aa3ae6c18d4---ropavesupujarilomatunar.pdfIn PDF document text
    • https://www.actionconstructionjax.com/wp-content/plugins/super-forms/uploads/php/files/e69e9955de68149e6338fa3a4c103b52/77918332263.pdfIn PDF document text
    • https://brokenspoke.com/wp-content/plugins/super-forms/uploads/php/files/b1671dceb7a5def68f0eaf9ad7b787ee/43915159816.pdfIn PDF document text
    • http://bjoybrands.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609e606474483---pugixew.pdfIn PDF document text
    • http://www.multigacos.com/admin/uploaded/fck/file/51075934796.pdfIn PDF document text
    • http://thefutureofgolf.eu/wp-content/plugins/formcraft/file-upload/server/content/files/160bdea017a32f---kuduxesemugedegorelebege.pdfIn PDF document text
    • http://sattamatkapatti.com/userfiles/file/buwiwimonukesamokuxug.pdfIn PDF document text
    • http://armanetti.com/images/samijos.pdfIn PDF document text
    • https://loctra.net/userfiles/file/30040885683.pdfIn PDF document text
    • https://celovechurch.org/wp-content/plugins/super-forms/uploads/php/files/ca31107c2eef9e80c354ac31693614d7/rukizomaguganomaravaviw.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e84e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE84E 4908 bytes
SHA-256: d78df5ec8d97012915f6014ef80a886ac4d1ee86bae51e49364efc7187737ca6
font_01_sfnt_off0000f912.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF912 11192 bytes
SHA-256: 3f4ce632db5b7e8292df499ec9b02f7e573a1b3ae3cb23807b28cf4a22001f47